void Viewport::MouseDown(const Helium::MouseButtonInput& input)
{
// reset drag mode
m_DragMode = DragModes::None;
// are we going to allow entering select drag?
bool allowSelection = true;
// if the camera modifier key is down
if (input.AltIsDown())
{
m_Cameras[m_CameraMode].MouseDown( input );
// camera now owns the drag
m_DragMode = DragModes::Camera;
// do NOT allow selection while moving the camera
allowSelection = false;
// Save the previous view before it is updated
UpdateCameraHistory();
}
else if (m_Tool) // else if we have a tool object
{
// hit test the tool, and if we intersect or its a tool modifier mouse key
if (m_Tool->MouseDown( input ) || input.MiddleDown() || input.RightDown())
{
// the tool now owns this drag
m_DragMode = DragModes::Tool;
}
else
{
// we can still allow selection if it didn't hit he tool
allowSelection = m_Tool->AllowSelection();
}
}
// if its the left key if we are still looking for a selection
if ( (input.LeftIsDown() || input.MiddleIsDown()) && m_DragMode == DragModes::None && allowSelection )
{
// we are selecting
m_DragMode = DragModes::Select;
// reset point trackers
m_Start = Point (input.GetPosition().x, input.GetPosition().y);
m_End = Point (input.GetPosition().x, input.GetPosition().y);
// reset selection frame
m_SelectionFrame->m_Start = m_Start;
m_SelectionFrame->m_End = m_End;
m_SelectionFrame->Update();
// if we are highlighting
if ( m_Highlighting )
{
// clear the previously highlighted set
m_ClearHighlight.Raise( ClearHighlightArgs (false) );
}
}
}
void Viewport::MouseUp( const Helium::MouseButtonInput& input )
{
// have we completed a drag?
bool dragComplete = false;
switch (m_DragMode)
{
case DragModes::None:
{
if (!m_Tool && input.RightUp())
{
m_End = Point (input.GetPosition().x, input.GetPosition().y);
m_SelectionFrame->m_End = m_End;
m_SelectionFrame->Update();
PickVisitor* pick = NULL;
SelectionTargetMode targetMode = SelectionTargetModes::Single;
if (m_SelectionFrame->m_Start.x == m_SelectionFrame->m_End.x && m_SelectionFrame->m_Start.y == m_SelectionFrame->m_End.y)
{
pick = new FrustumLinePickVisitor (&m_Cameras[m_CameraMode], m_SelectionFrame->m_Start.x, m_SelectionFrame->m_Start.y);
targetMode = SelectionTargetModes::Single;
}
else
{
Frustum worldSpaceFrustum;
if ( m_Cameras[m_CameraMode].ViewportToFrustum( (float32_t)m_SelectionFrame->m_Start.x, (float32_t)m_SelectionFrame->m_Start.y, (float32_t)m_SelectionFrame->m_End.x, (float32_t)m_SelectionFrame->m_End.y, worldSpaceFrustum) )
{
Point center ( m_SelectionFrame->m_Start + m_SelectionFrame->m_End / 2 );
Line line;
m_Cameras[m_CameraMode].ViewportToLine( (float32_t)center.x, (float32_t)center.y, line);
pick = new FrustumLinePickVisitor(&m_Cameras[m_CameraMode], line, worldSpaceFrustum );
targetMode = SelectionTargetModes::Multiple;
}
}
if ( pick )
{
m_Select.Raise( SelectArgs (pick, SelectionModes::Manifest, targetMode) );
delete pick;
pick = NULL;
}
// our drag is complete now
dragComplete = true;
}
break;
}
case DragModes::Select:
{
if (input.LeftUp() || input.MiddleUp())
{
m_End = Point (input.GetPosition().x, input.GetPosition().y);
m_SelectionFrame->m_End = m_End;
m_SelectionFrame->Update();
PickVisitor* pick = NULL;
SelectionTargetMode targetMode = SelectionTargetModes::Single;
if (m_SelectionFrame->m_Start.x == m_SelectionFrame->m_End.x && m_SelectionFrame->m_Start.y == m_SelectionFrame->m_End.y)
{
pick = new FrustumLinePickVisitor (&m_Cameras[m_CameraMode], m_SelectionFrame->m_Start.x, m_SelectionFrame->m_Start.y);
targetMode = SelectionTargetModes::Single;
}
else
{
Frustum worldSpaceFrustum;
if ( m_Cameras[m_CameraMode].ViewportToFrustum( (float32_t)m_SelectionFrame->m_Start.x, (float32_t)m_SelectionFrame->m_Start.y, (float32_t)m_SelectionFrame->m_End.x, (float32_t)m_SelectionFrame->m_End.y, worldSpaceFrustum) )
{
Point center ( m_SelectionFrame->m_Start + m_SelectionFrame->m_End / 2 );
Line line;
m_Cameras[m_CameraMode].ViewportToLine( (float32_t)center.x, (float32_t)center.y, line);
pick = new FrustumLinePickVisitor (&m_Cameras[m_CameraMode], line, worldSpaceFrustum);
targetMode = SelectionTargetModes::Multiple;
}
}
if ( pick )
{
SelectionModes::SelectionMode selectMode;
if (input.MiddleUp())
{
selectMode = SelectionModes::Manifest;
}
else
{
if ( input.CtrlIsDown() )
{
if ( input.ShiftIsDown())
{
selectMode = SelectionModes::Add;
}
else
{
selectMode = SelectionModes::Remove;
}
}
else
{
if ( input.ShiftIsDown())
{
selectMode = SelectionModes::Toggle;
}
else
{
selectMode = SelectionModes::Replace;
}
}
}
m_Select.Raise( SelectArgs (pick, selectMode, targetMode) );
delete pick;
pick = NULL;
}
// our drag is complete now
dragComplete = true;
}
break;
}
case DragModes::Camera:
{
if (input.AltIsDown())
{
m_Cameras[m_CameraMode].MouseUp( input );
}
break;
}
default:
{
if (m_Tool)
{
m_Tool->MouseUp( input );
}
break;
}
}
if (dragComplete)
{
m_DragMode = DragModes::None;
}
}